Cheapest return flights from Washington to London in December from $795

Best time to book flights for Washington (IAD) to London (LTN) flights at AirHint

AirHint found the following cheapest return flights from Washington (IAD) to London (LTN) in December 2025 (see full year).

Return flights

02 Dec - 16 Dec TAP
02 Dec - 14 Dec TAP
02 Dec - 17 Dec TAP
10 Dec - 17 Dec Icelandair
21 Dec - 30 Dec Icelandair
31 Dec - 13 Jan TAP
08 Dec - 15 Dec Icelandair
02 Dec - 24 Dec TAP
05 Dec - 13 Dec Icelandair
16 Dec - 30 Dec TAP
01 Dec - 11 Dec Icelandair
17 Dec - 02 Jan Icelandair
13 Dec - 02 Jan Icelandair
20 Dec - 03 Jan Icelandair
26 Dec - 09 Jan Air Canada
27 Dec - 01 Jan Icelandair
27 Dec - 08 Jan Icelandair
13 Dec - 31 Jan Icelandair
23 Dec - 13 Jan Lufthansa
30 Dec - 16 Jan Icelandair

Also check the deals for one-way flights from Washington to London in December.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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